| 摘要 |
<p>PURPOSE:To correct the correlative inclination amount between an information recording holder and a sensor array by reading a recording pattern on a track among information tracks that is distant by a specified length by means of the sensor array and detecting the correlative inclination amount between the parallel direction of the array of sensors and the parallel direction of information. CONSTITUTION:An optical card in which plural information tracks are arrayed in a direction approximately vertical to the parallel direction of the array of information on the information track, when inserted to the title device, is stopped in its home position prior to the reproduction of information. During such transfer, the sensor array relatively moves for a length l from a position 7a capable of reproducing from an information track 23 on the optical card to another position 7b capable of reproducing from an information track 24. Accordingly, the difference D between the position where the sensor array reproduced the bit 22a of a recording pattern and the position where a bit 22b is reproduced, is calculated from an output waveform from the sensor array and the magnification or an optical system, in order to obtain the inclination thetabetween the sensor array and the information tracks, and the corrected so as to make the theta zero.</p> |
